In this paper, we go further: in addition to being radiation-dominated in the past, our universe will be vacuum energy dominated in the future. We start by studying the simplest cosmology of this type – a universe with just radiation and vacuum energy – paying special attention to the structure (symmetries and complex-analytical properties) of its maximal analytic extension, which we regard as key clues. We then add matter, requiring it to respect this structure. We point out that, in addition to the features and predictions pointed out in [1]}, [2]}, this picture provides other insights, including a new solution to an old problem: why the thermodynamic arrow of time points away from the bang [3]}, [4]}.
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